Curve of the sine function
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Move the point P on the trigonometric circle.
The point N has abscissa α and ordinate sin(α).
The resulting curve is the graphical representation of the sine function on [0;2π].
Courbe de la fonction sinus
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What happens to α when P makes more than one turn?
How does the curve behave then?
What if P turns in the nontrigonometric direction?